Evidence map›Paper›PMID 2499545›Full record

ArticleInfection and immunity1989

Calcium is required for the expression of anthrax lethal toxin activity in the macrophagelike cell line J774A.1.

R Bhatnagar, Y Singh, S H Leppla, A M Friedlander

Open access · bronzeAbstract read
In one paragraph

Article in Infection and immunity, 1989. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed
1.4field-weighted citation impact, top 18% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

19 citing papers in PubMed, 79 citations in OpenAlex.

  1. The Importance of Therapeutically Targeting the Binary Toxin fromInternational journal of molecular sciences · 2021
    Review
  2. Structure of the cell-binding component of theProceedings of the National Academy of Sciences of the United States of America · 2020
    Article
  3. Article
  4. Article
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  7. Review
  8. Article
  9. Anthrax lethal factor represses glucocorticoid and progesterone receptor activity.Proceedings of the National Academy of Sciences of the United States of America · 2003
    Article
  10. Article
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  15. Death at Sverdlovsk: what have we learned?The American journal of pathology · 1994
    Review
  16. Article
  17. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 1 institution in 1 country.

R BhatnagarUnited States Army Medical Research Institute of Infectious Diseases, Frederick, Maryland 21701-5011.
Y Singh
S H Leppla
A M Friedlander
United States Army Medical Research Institute of Infectious Diseases · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Anthrax lethal toxin, which consists of two separate proteins, protective antigen (Mr, 82,700) and lethal factor (Mr, approximately 83,000), is cytotoxic to the macrophagelike cell line J774A.1. Removal of calcium from the culture medium protected cells against the action of lethal toxin. Calcium depletion during the binding phase of intoxication afforded only partial protection. Further analysis showed that calcium removal caused some inhibition of protective antigen binding but that it had minimal effect on proteolytic conversion of protective antigen to the active 63-kilodalton fragment and that it had no effect on lethal factor binding. Cells to which lethal toxin had bound in the presence of calcium were protected when transferred to calcium-depleted culture medium, indicating a role for calcium at a postbinding stage. When ammonium chloride is present with lethal toxin, toxin accumulates in intracellular vesicles. Calcium-free medium protected these cells upon removal of the amine block, suggesting that calcium is also required at a step after internalization of lethal toxin. Calcium channel blockers inhibited 45Ca2+ uptake and protected cells against cytotoxicity. Calmodulin inhibitors also protected against the action of lethal toxin, suggesting involvement of calmodulin at a step during intoxication. We conclude that calcium is required at several steps in the intoxication of cells by anthrax lethal toxin.

Indexed as

AnimalsAntigens, BacterialBacillus anthracisBacterial ProteinsBacterial ToxinsCalciumCalcium Channel BlockersCalmodulinCell LineCytotoxicity, ImmunologicMacrophagesMiceProtease InhibitorsReceptors, Immunologicanthrax toxinAntigens, BacterialBacterial ProteinsBacterial ToxinsCalciumCalcium Channel BlockersCalmodulinProtease InhibitorsReceptors, Immunologic

Identifiers

PMID2499545
PMCPMC313848
OpenAlexW2153648499

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.